tests: Add mbedtls_test_ prefix to unhexify_alloc()

Add mbedtls_test_ prefix to unhexify_alloc() test helper
functions.

Command to change *.function files:
find . -name "*.function" -exec awk -i inplace \
    '{sub(/unhexify_alloc\>/,"mbedtls_test_&")}1' {} \;

Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/tests/suites/test_suite_hkdf.function b/tests/suites/test_suite_hkdf.function
index 9781e7f..47e8ee6 100644
--- a/tests/suites/test_suite_hkdf.function
+++ b/tests/suites/test_suite_hkdf.function
@@ -63,9 +63,9 @@
     output_prk_len = mbedtls_md_get_size( md );
     output_prk = mbedtls_calloc( 1, output_prk_len );
 
-    ikm = unhexify_alloc( hex_ikm_string, &ikm_len );
-    salt = unhexify_alloc( hex_salt_string, &salt_len );
-    prk = unhexify_alloc( hex_prk_string, &prk_len );
+    ikm = mbedtls_test_unhexify_alloc( hex_ikm_string, &ikm_len );
+    salt = mbedtls_test_unhexify_alloc( hex_salt_string, &salt_len );
+    prk = mbedtls_test_unhexify_alloc( hex_prk_string, &prk_len );
     TEST_ASSERT( prk_len == output_prk_len );
 
     ret = mbedtls_hkdf_extract( md, salt, salt_len, ikm, ikm_len, output_prk );
@@ -98,9 +98,9 @@
 
     output_okm = mbedtls_calloc( OKM_LEN, 1 );
 
-    prk = unhexify_alloc( hex_prk_string, &prk_len );
-    info = unhexify_alloc( hex_info_string, &info_len );
-    okm = unhexify_alloc( hex_okm_string, &okm_len );
+    prk = mbedtls_test_unhexify_alloc( hex_prk_string, &prk_len );
+    info = mbedtls_test_unhexify_alloc( hex_info_string, &info_len );
+    okm = mbedtls_test_unhexify_alloc( hex_okm_string, &okm_len );
     TEST_ASSERT( prk_len == mbedtls_md_get_size( md ) );
     TEST_ASSERT( okm_len < OKM_LEN );